②Features: Hex Shank is easy to install and tighten ,prevent the bit from slipping. Extra sharp cutting spurs is especially designed for cutting through hard and soft wood or other materials smoothly and efficiently.
③Great Performance: Easily make flat-bottomed and pocket holes with no chipping on any wood or wood products, plastic, polywood and other materials during processing or installation.
④High Quality: Good material assures toughness and good resistance to shock,reduces cutting time.
⑤Application: 3/8″ reduced shank fits any electric power machines and drill presses.
4. IRWIN Marples Forstner Bit Set, 14-Piece (1966893)
Drilling with forstner bits to achieve a flat bottom hole or to start a deep hole turning project like on a larger vase or vessel is essentially impossible with a standard length forstner bit. To remedy this issue we have developed a heavy duty steel extension that allows you to secure a 3/8 inch shank forstner bit into the end collet.
The forstner bit extension gives you additional 5-5/8 inches of reach to bore deeper into your projects. This will help you create larger diameter starter holes or help when you need to drill in just a little further than the standard bit length will allow. The extension can be used with forstner bits on drill presses, lathes with a drill chuck installed (drill chuck not included) or with a power drill.
One of the most common uses for the forstner bit extension is for woodturners who need to bore out starter holes on larger vessels. However, the extension works exceptionally well for projects like salt shakers, pepper mills or even wood turned beverage mugs. Contractors use the extension when they need to bore deep holes for running cables or wires and they also use it for joining larger timbers.
The forstner bit extender is made from solid, heavy duty machined steel. It is designed to be used with forstner bits only. The collet inside diameter is 3/8 inch. This tolerance is very tight and designed to accept forstner bits with shank sizes of 3/8 inch or slightly smaller. Please note that some forstner bit manufacturers produce bits that say 3/8 inch shank size when in fact they are not. If you measure your bit shank and it is 3/8 inch, your bit should fit once the set screws are loosened
The collet outside diameter is
25/32 inch without the set screws protruding outward. The reason this is important is that as we mentioned earlier, some bits may have slightly different shank sizes. This means the set screws may protrude outwardly from the collet. The minimum size hole this extension will allow you to drill is 13/16 inch. Forstner bits and Machinery shown in pictures are NOT included.
6. PORTER-CABLE Forstner Bit Set, 14-Piece (PC1014)
Advanced technology manufacturing and durable material – Made from Tungsten steel and being hot-treated, the blade is characterized by high accuracy, smooth cutting operation, good resistance to shock and good toughness.
High Quality – Small incision resistance, improve the opening speed, chip easy and no tremor. The perforation is neat, smooth, no broken edge.
Designed for durability and long life, creates a fine smooth finish.
16Pcs include 16 different boring diameters: 15mm/16mm/17mm/18mm/19mm/20mm/21mm/22mm/23mm/24mm/25mm/26mm/28mm/30mm/32mm/35mm.
Wide range of applications – Any wood and wood products, plastic, plywood and other materials you need to exquisite perforation, suitable for industrial hinge installation, wood processing and maintenance, model production, installation of spherical door, drawers and other occasions.
9. Freud Precision Shear™ Forstner Drill Bit 3/8-Inch (PB-002)